GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 201,083	$ 170,421	$ 170,421
Other Intangible Assets	11,826	9,885
Total goodwill and other intangible assets	212,909	180,306
Core deposit intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Other Intangible Assets	10,264	9,269
Other identifiable Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Other Intangible Assets	$ 1,562	$ 616